2 * vim:ts=2:sw=2:noexpandtab
5 #include "xbt/sysdep.h"
8 static int closest_preceding_node(int id);
9 static void check_predecessor(void);
11 XBT_LOG_NEW_DEFAULT_CATEGORY(chord,"Messages specific to this example");
13 typedef enum msg_typus{
23 /*GRAS_DEFINE_TYPE(s_pbio,
30 typedef struct s_pbio pbio_t;*/
32 //GRAS_DEFINE_TYPE(s_ping,
37 typedef struct s_ping ping_t;
39 //GRAS_DEFINE_TYPE(s_pong,
45 typedef struct s_pong pong_t;
47 GRAS_DEFINE_TYPE(s_get_suc,
52 typedef struct s_get_suc get_suc_t;
54 GRAS_DEFINE_TYPE(s_rep_suc,
61 typedef struct s_rep_suc rep_suc_t;
63 typedef struct finger_elem{
71 static void register_messages(){
72 /* gras_msgtype_declare("chord",gras_datadesc_by_symbol(s_pbio));*/
73 gras_msgtype_declare("chord_get_suc",gras_datadesc_by_symbol(s_get_suc));
74 gras_msgtype_declare("chord_rep_suc",gras_datadesc_by_symbol(s_rep_suc));
77 /* Global private data */
79 gras_socket_t sock; /* server socket on which I'm listening */
80 int id; /* my id number */
81 char host[1024]; /* my host name */
82 int port; /* port on which I'm listening FIXME */
83 int fingers; /* how many fingers */
84 finger_elem *finger; /* finger table */
85 char pre_host[1024]; /* predecessor host */
86 int pre_port; /* predecessor port */
90 int node(int argc,char **argv);
92 /*static int node_cb_chord_handler(gras_socket_t expeditor,void *payload_data){
94 pbio_t pbio_i=*(pbio_t*)payload_data;
96 node_data_t *globals=(node_data_t*)gras_userdata_get();
98 INFO4(">>> %d : received %d message from %s to %d <<<",globals->id,pbio_i.type,gras_socket_peer_name(expeditor),pbio_i.dest);
104 static int node_cb_get_suc_handler(gras_socket_t expeditor,void *payload_data){
106 get_suc_t incoming=*(get_suc_t*)payload_data;
108 node_data_t *globals=(node_data_t*)gras_userdata_get();
109 INFO2("Received a get_successor message from %s for %d",gras_socket_peer_name(expeditor),incoming.id);
110 if((globals->id==globals->finger[0].id)||(incoming.id>globals->id&&incoming.id<=globals->finger[0].id)){
111 outgoing.id=globals->finger[0].id;
112 snprintf(outgoing.host,1024,globals->finger[0].host);
113 outgoing.port=globals->finger[0].port;
114 INFO0("My successor is his successor!");
116 gras_socket_t temp_sock;
117 int contact=closest_preceding_node(incoming.id);
118 get_suc_t asking;asking.id=incoming.id;
120 temp_sock=gras_socket_client(globals->finger[contact].host,globals->finger[contact].port);
122 RETHROW0("Unable to connect!: %s");
125 gras_msg_send(temp_sock,gras_msgtype_by_name("chord_get_suc"),&asking);
127 RETHROW0("Unable to ask!: %s");
129 gras_msg_wait(10.0,gras_msgtype_by_name("chord_rep_suc"),&temp_sock,&outgoing);
133 gras_msg_send(expeditor,gras_msgtype_by_name("chord_rep_suc"),&outgoing);
134 INFO0("Successor information sent!");
136 RETHROW2("%s:Timeout sending successor information to %s: %s",globals->host,gras_socket_peer_name(expeditor));
138 gras_socket_close(expeditor);
142 static int closest_preceding_node(int id){
143 node_data_t *globals=(node_data_t*)gras_userdata_get();
145 for(i=globals->fingers-1;i>=0;i--){
146 if(globals->finger[i].id>globals->id&&globals->finger[i].id<id){
154 static void check_predecessor() {
155 node_data_t *globals = (node_data_t*)gras_userdata_get();
156 gras_socket_t temp_sock;
158 if (globals->pre_host[0] == 0)
164 temp_sock = gras_socket_client( globals->pre_host, globals->pre_port );
168 globals->pre_host[0] = 0;
169 globals->pre_port = 0;
176 gras_msg_send( temp_sock, gras_msgtype_by_name("chord_ping"),&ping_kong);
180 globals->pre_host[0] = 0;
181 globals->pre_port = 0;
185 gras_msg_wait( 6969, gras_msgtype_by_name("chord_pong"), &temp_sock, &king_pong);
189 globals->pre_host[0] = 0;
190 globals->pre_port = 0;
192 gras_socket_close(temp_sock);
195 int node(int argc,char **argv){
196 node_data_t *globals=NULL;
197 gras_socket_t temp_sock=NULL;
198 gras_socket_t temp_sock2=NULL;
206 /* 1. Init the GRAS infrastructure and declare my globals */
207 gras_init(&argc,argv);
209 gras_os_sleep((15-gras_os_getpid())*20);
211 globals=gras_userdata_new(node_data_t);
213 globals->id=atoi(argv[1]);
214 globals->port=atoi(argv[2]);
216 globals->finger=NULL;
217 globals->pre_host[0]=0;
218 globals->pre_port=-1;
220 snprintf(globals->host,1024,gras_os_myname());
225 asprintf(&other_host,"%s",argv[3]);
226 other_port=atoi(argv[4]);
229 globals->sock=gras_socket_server(globals->port);
235 globals->finger=(finger_elem*)calloc(1,sizeof(finger_elem));
236 INFO2("Launching node %s:%d",globals->host,globals->port);
238 INFO0("→Creating ring");
239 globals->finger[0].id=globals->id;
240 snprintf(globals->finger[0].host,1024,globals->host);
241 globals->finger[0].port=globals->port;
243 INFO2("→Known node %s:%d",other_host,other_port);
244 INFO0("→Contacting to determine successor");
246 temp_sock=gras_socket_client(other_host,other_port);
248 RETHROW0("Unable to contact known host!: %s");
250 get_suc_t get_suc_msg;get_suc_msg.id=globals->id;
252 gras_msg_send(temp_sock,gras_msgtype_by_name("chord_get_suc"),&get_suc_msg);
254 gras_socket_close(temp_sock);
255 RETHROW0("Unable to contact known host to get successor!: %s");
257 rep_suc_t rep_suc_msg;
259 INFO0("Waiting for reply!");
260 gras_msg_wait(6000,gras_msgtype_by_name("chord_rep_suc"),&temp_sock2,&rep_suc_msg);
262 RETHROW1("%s: Error waiting for successor:%s",globals->host);
264 globals->finger[0].id=rep_suc_msg.id;
265 snprintf(globals->finger[0].host,1024,rep_suc_msg.host);
266 globals->finger[0].port=rep_suc_msg.port;
267 INFO3("→Got successor : %d-%s:%d",globals->finger[0].id,globals->finger[0].host,globals->finger[0].port);
268 gras_socket_close(temp_sock);
271 gras_cb_register(gras_msgtype_by_name("chord_get_suc"),&node_cb_get_suc_handler);
272 // gras_cb_register(gras_msgtype_by_name("chord_ping"),&node_cb_ping_handler);
274 gras_msg_handle(60.0);
276 gras_socket_close(globals->sock);